How to Build Dual-Pass Strokes with FSCSS Array Methods
clip-path: polygon() can fill a shape. It cannot stroke one. So pure-CSS chart lines in FSCSS (and libraries like st-core) fake a stroke with a dual-pass polygon : walk the data forward for the top edge, walk it backward for a parallel edge offset by line width, fill the thin band between them. This post unpacks that pattern with @arr , inline() , $ , count() , and .reverse — the same building…
Creating dual-pass strokes with FSCSS array methods involves using a specific pattern to simulate a stroke on a shape that cannot be directly stroked using pure CSS. This technique, popularized by the FSCSS library and similar tools like st-core, achieves a line-like appearance by creating a dual-pass polygon effect. The process can be broken down into several key steps, each utilizing specific FSCSS functions and custom properties to build a visually appealing line chart effect.
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